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x in (-oo:+oo)
(1/3)*(12-(15*x)) = 1-((1/6)*(2*x+6)) // - 1-((1/6)*(2*x+6))
(1/3)*(12-(15*x))+(1/6)*(2*x+6)-1 = 0
(1/3)*(12-15*x)+(1/6)*(2*x+6)-1 = 0
1/3*(12-15*x)+1/6*(2*x+6)-1 = 0
1/3*(12-15*x)+1/6*(2*x+6)-1 = 0
5-14/3*x-1 = 0
4-14/3*x = 0
4-14/3*x = 0
4-14/3*x = 0 // - 4
-14/3*x = -4 // : -14/3
x = -4/(-14/3)
x = 6/7
x = 6/7
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